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草业学报 ›› 2026, Vol. 35 ›› Issue (7): 80-91.DOI: 10.11686/cyxb2025237

• 研究论文 • 上一篇    下一篇

黄土高原典型草本植物根系对土壤胶体表面电化学性质的影响

刘均阳1(), 周正朝2(), 苏雪萌3   

  1. 1.延安大学生命科学学院,陕西 延安 716000
    2.陕西师范大学地理科学与旅游学院,陕西 西安 710119
    3.陕西理工大学人文学院,陕西 汉中 723001
  • 收稿日期:2025-06-16 修回日期:2025-09-18 出版日期:2026-07-20 发布日期:2026-05-21
  • 通讯作者: 周正朝
  • 作者简介:Corresponding author. E-mail: zczhou@snnu.edu.cn
    刘均阳(1987-),女,辽宁营口人,讲师,博士。E-mail: jyliu@yau.edu.cn
  • 基金资助:
    国家自然科学基金项目(42407478);国家自然科学基金项目(42277320);陕西省杰青项目(2023-JC-JQ-27);陕西省自然科学基础研究计划项目(2024JC-YBQN-0314);延安大学博士启动项目(YAU202313804)

Effects of typical herbaceous plant roots on electrochemical properties of the soil colloid surface on the Loess Plateau

Jun-yang LIU1(), Zheng-chao ZHOU2(), Xue-meng SU3   

  1. 1.School of Life Sciences,Yan’an University,Yan’an 716000,China
    2.School of Geographical Sciences and Tourism,Shaanxi Normal University,Xi’an 710119,China
    3.College of Humanities,Shaanxi University of Technology,Hanzhong 723001,China
  • Received:2025-06-16 Revised:2025-09-18 Online:2026-07-20 Published:2026-05-21
  • Contact: Zheng-chao ZHOU

摘要:

植物根系对土壤胶体表面电化学性质有显著影响。为量化植物根系与土壤胶体表面电化学性质的响应关系,本试验以黄土高原3个不同采样区(神木、安塞和永寿)的典型草本植物为研究对象,对根系形态参数和土壤胶体表面电化学性质进行了测定和分析。结果表明:研究区不同样地土壤表面电场、表面电势、表面电荷数量、比表面积和表面电荷密度的变化范围分别是1.23×108~28.46×108 V·m-1、-149.91~-81.33 mV、7.26~24.34 cmolc·kg-1、8.32~147.38 m2·g-1和0.09~2.02 C·m-2。根系形态参数(根长密度、根表面积密度和根体积密度)与土壤胶体表面电化学性质显著相关(P<0.05,P<0.01),并且0 mm<d≤0.5 mm径级的细根是影响土壤胶体表面电化学性质的关键。根表面积密度与土壤表面电场、表面电势和表面电荷密度指数函数负相关,与土壤比表面积和表面电荷数量指数函数正相关(R2=0.35~0.67,P<0.01)。植物根系对土壤胶体表面电化学性质的影响以间接方式为主,主要通过改变土壤理化性质来实现。此外,由于不同采样区植物根系的生长以及与土壤互馈机制的差异,植物根系在神木地区对土壤胶体表面电化学性质的影响最为显著,其次是安塞和永寿地区。该研究有助于进一步认识植物根系对土壤胶体表面电化学性质的影响,为土壤功能和退化生态系统的恢复提供基础科学依据。

关键词: 植物根系, 土壤胶体, 表面电化学性质, 黄土高原

Abstract:

Plant roots have a significant effect on the electrochemical properties of the surface of soil colloids. To quantify the response relationship between plant roots and the electrochemical properties of the soil colloid surface, we analyzed and compared soil colloids and roots of typical herbaceous plants from three different sampling areas on the Loess Plateau (Shenmu, Ansai, and Yongshou). The root morphological parameters and electrochemical properties of soil colloids’ surface were measured and analyzed. The soil surface electric field, surface potential, surface charge quantity, specific surface area, and surface charge density in different sampling sites in study areas ranged from 1.23×108 to 28.46×108 V·m-1, from -149.91 to -81.33 mV, from 7.26 to 24.34 cmolc·kg-1, from 8.32 to 147.38 m2·g-1, and from 0.09 to 2.02 C·m-2, respectively. Root morphological parameters (root length density, root surface area density, and root volume density) were significantly correlated with the electrochemical properties of the soil colloid surface (P<0.05, P<0.01). Fine root (0 mm<diameter≤0.5 mm) was the key factor affecting the electrochemical properties of the soil colloid surface. The root surface area density had exponential negative relationships with soil surface electric field, surface potential, and surface charge density, and exponential positive correlations with soil specific surface area and surface charge quantity (R2=0.35-0.67, P<0.01). The influence of plant roots on electrochemical properties of the soil colloid surface was mainly indirect, primarily through changes in soil physicochemical properties. Moreover, because of differences in plant root growth and the feedback mechanisms between roots and soil in different sampling areas, the impact of plant roots on electrochemical properties of the soil colloid surface was most significant in Shenmu, followed by Ansai and Yongshou. The findings of this study clarify the impact of root systems on the electrochemical properties of the soil colloid surface and provide a scientific basis for the restoration of soil functions and degraded ecosystems.

Key words: plant roots, soil colloid, surface electrochemical properties, Loess Plateau